size versus scale?
 

when an ARF is described as .40, .60 or 1.50, what exactly does that mean or refer to?

how do they correspond to various "scales" (i.e. 1/5, 1/6, etc.) that I see many references to?

thanks for the info,

RE: size versus scale?
 

the .40, .60 etc corresponds to the engine displacement that the kit is built around, ie needed to fly it. dick

RE: size versus scale?
 

A 1/6th scale P51 might require a .46 cu in size engine whereas a 1/6 scale Piper Cub might require an .15 cu in. Usually a kit will have both designations as well as wingspan, length, wing area and wing loading. After you have been in the hobby for a while all you need is a couple of those pieces of information and if you are familliar with the airplane style you can guess at the rest pretty well.

RE: size versus scale?
 

Right. There's no direct correlation between .40, .60, 1.20 (engine size) and scale.
Dennis-

RE: size versus scale?
 

in general, and this is really stretching it at best, .40 is about 15% scale, and 1.20 is usually about quarter scale. that said, there isn't much correlation and it depends on the plane more than anything else. (a 1.20 scale bomber isn't exactly 25%!!)